package com.example.demo.project.utils;

import java.util.Random;

public class PassWordCreate {
	/** 
    * 获得密码 
    * @param len 密码长度 
    * @return 
    */  
   public static String createPassWord(int len){
       int random = createRandomInt();  
       return createPassWord(random, len);  
   }  
     
   private static String createPassWord(int random, int len){
       Random rd = new Random(random);
       final int  maxNum = 62;  
       StringBuffer sb = new StringBuffer();
       int rdGet;//取得随机数  
       char[] str = { 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k',  
               'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w',  
               'x', 'y', 'z', 'A','B','C','D','E','F','G','H','I','J','K',  
               'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W',  
               'X', 'Y' ,'Z', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9' };  
         
       int count=0;  
       while(count < len){  
           rdGet = Math.abs(rd.nextInt(maxNum));//生成的数最大为62-1
           if (rdGet >= 0 && rdGet < str.length) {  
               sb.append(str[rdGet]);  
               count ++;  
           }  
       }  
       return sb.toString();  
   }  
     
   private static int createRandomInt(){  
       //得到0.0到1.0之间的数字，并扩大100000倍  
       double temp = Math.random()*100000;
       //如果数据等于100000，则减少1  
       if(temp>=100000){  
           temp = 99999;  
       }  
       int tempint = (int) Math.ceil(temp);
       return tempint;  
   }  
     
   public static void main(String[] args){
       System.out.println(createPassWord(8));
   }  
}
